1691148442 has 4 divisors (see below), whose sum is σ = 2536722666. Its totient is φ = 845574220.

The previous prime is 1691148353. The next prime is 1691148461. The reversal of 1691148442 is 2448411961.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1117498041 + 573650401 = 33429^2 + 23951^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1691148395 and 1691148404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422787109 + ... + 422787112.

Almost surely, 2^1691148442 is an apocalyptic number.

1691148442 is a deficient number, since it is larger than the sum of its proper divisors (845574224).

1691148442 is an equidigital number, since it uses as much as digits as its factorization.

1691148442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845574223.

The product of its digits is 55296, while the sum is 40.

The square root of 1691148442 is about 41123.5752579953. The cubic root of 1691148442 is about 1191.4081773951.

The spelling of 1691148442 in words is "one billion, six hundred ninety-one million, one hundred forty-eight thousand, four hundred forty-two".